Kinetic modeling of Fischer–Tropsch synthesis over<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si177.gif" display="inline" overflow="scroll"><mml:mi>Fe</mml:mi><mml:mo>–</mml:mo><mml:mi>Cu</mml:mi><mml:mo>–</mml:mo><mml:mi mathvariant="normal">K</mml:mi><mml:mo>–</mml:mo><mml:msub><mml:mrow><mml:mi>SiO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>catalyst in slurry phase reactor

Chang, Jie; Bai, Lei; Teng, Botao; Zhang, Rongle; Yang, Jun; Xu, Yuan; Xiang, Huimin; Li, Yongwang

doi:10.1016/j.ces.2006.12.031

Cited by 82 publications

(28 citation statements)

References 22 publications

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“…However such models are theoretically justified only if it can be assumed that the reaction products do not affect or participate in the monomer formation mechanism and vice versa, and we have shown that this is not likely to occur [13]. More advanced approaches, involving the development of combined CO conversion and product distribution models, have been also proposed [14][15][16], but even some of those models have been developed introducing empirical or speculative hypotheses such as the presence of three different catalytic sites [17] to explain the complex FTS products distribution and in particular the deviations from the theoretical ASF plot.…”

mentioning

confidence: 98%

Detailed Kinetics of the Fischer–Tropsch Synthesis on Cobalt Catalysts Based on H-Assisted CO Activation

et al. 2011

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A complete mechanistic kinetic model of the Fischer-Tropsch synthesis (FTS) over a Co/Al 2 O 3 stateof-the-art catalyst is developed here under conditions relevant to industrial operation. On the basis of the most recent findings on the reaction mechanism, here described according to the H-assisted CO dissociation theory and the alkyl chain growth mechanism, and on the basis of the latest indications available on the rate determining step involved in the CO activation process, rate expressions for all the steps leading to CO and H 2 consumption and n-paraffins, a-olefins and H 2 O formation are derived. Such expressions are functions of the molar fraction of CO, H 2 and olefins in the liquid phase surrounding the catalyst pellets, that in turn are related to the gas-phase pressure and composition, and of the surface coverage of the adsorbed species. Thermodynamic and kinetic parameters involved in the model are estimated by nonlinear multi-response regression on a complete set of FTS experimental data collected in a lab-scale tubular reactor at steady-state conditions (P = 8-25 bar, T = 210-235°C, H 2 /CO feed ratio = 1.8-2.7 mol mol -1 , GHSV = 2,000-7,000 cm 3 (STP) h -1 g cat -1). Both the experimental CO conversion and the hydrocarbon distribution (up to N = 50) in FTS are well predicted by the model with 13 adaptive parameters, without the need of introducing any empirical parameter. Analysis of the model offers insight in the rates of the elementary steps associated with the reaction mechanism and in the surface coverages of the adsorbed species. Such information explains the peculiar reactivity observed over cobalt-based Fischer-Tropsch catalysts, and can provide guidelines for the design of more active and selective catalytic materials.

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mentioning

confidence: 98%

Detailed Kinetics of the Fischer–Tropsch Synthesis on Cobalt Catalysts Based on H-Assisted CO Activation

et al. 2011

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“…Because they may be treated as combination of preexponential factors of several catalyst surface processes (adsorption, reaction, desorption) that are involved in the mechanism. Unfortunately, it is not possible to compare the estimated preexponential of this study with other studies [5][6][7][8][9]23], because in our kinetic study, the preexponential factors have been lumped together while in other FT kinetic literatures [5][6][7][8][9]23] the preexponential factor of each elementary reaction has been separately estimated.…”

Section: Elementary Reaction Modelmentioning

confidence: 95%

“…The formation of product was based on CH 2 insertion alkyl mechanism. The other comprehensive LHHW kinetics model was proposed by Chang et al [8] based on hydroxyl methylene (CH 2 OS) monomer formation mechanism and methylene insertion via the alkylidene propagation mechanism on a Fe-Cu-K-SiO 2 catalyst. Visconti et al [9] investigated a complete set of reaction scheme based on carbide theory (direct dissociation of adsorbed CO) and CH 2 insertion alkyl mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…A model based on carbide and CO-insertion mechanism was able to describe the experiments on a Fe catalyst. Recent approaches for kinetic modeling of FTS product distribution are mainly based on detailed mechanisms and LHHW methods similar to the Lox [5][6][7][8]. Wang et al [5] employed the Lox detailed mechanisms and a detailed kinetic model was derived after some modifications.…”

Section: Introductionmentioning

confidence: 99%

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CO hydrogenation reaction over FeCo catalyst; a micro-kinetic approach for studying the kinetics and mechanism of hydrocarbon formation

Shiva¹,

Atashi²,

Tabrizi³

et al. 2013

Journal of Industrial and Engineering Chemistry

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“…Polymerization occurs through initiation of chains, competing chain propagation and chain termination steps [2]. Few models on the polymerization mechanism of the FischerTropsch reaction are described in literature [1,[3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Polymerization Model for Fischer‐Tropsch Synthesis

Fontenelle

Fernandes

2011

Chem Eng & Technol

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The polymerization kinetics of Fischer-Tropsch reactions on a cobalt-based catalyst was studied. A kinetic model was developed based on the alkyl and alkenyl mechanisms for hydrocarbon chain propagation that may occur simultaneously in the Fischer-Tropsch synthesis. The kinetic model comprised initiation of hydrocarbon chains, propagation, termination to paraffin and olefin and readsorption of olefin. The proposed model was validated by F-test and proved valid at a confidence level of 95 %.

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Kinetic modeling of Fischer–Tropsch synthesis overFe–Cu–K–SiO2catalyst in slurry phase reactor

Cited by 82 publications

References 22 publications

Detailed Kinetics of the Fischer–Tropsch Synthesis on Cobalt Catalysts Based on H-Assisted CO Activation

Detailed Kinetics of the Fischer–Tropsch Synthesis on Cobalt Catalysts Based on H-Assisted CO Activation

CO hydrogenation reaction over FeCo catalyst; a micro-kinetic approach for studying the kinetics and mechanism of hydrocarbon formation

Comprehensive Polymerization Model for Fischer‐Tropsch Synthesis

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